Solar plane: around the world without fuel & with zero emissions
Solar Impulse has the wingspan of a Jumbo Jet but the weight of a small car. However one thing that this solar plane cannot handle is bad weather. Because the solar panels are needed for day flying and for charging the 400-kilogram lithium batteries that power the plane by night, it relies on sunshine.
Trivia: Adventurer Bertrand Piccard(co-founder) in 1999 co-piloted the first round-the-globe non-stop balloon flight.